Electric cooking-stove.



A. 0. CHRISTENSEN.

ELECTRIC COOKING, STOVE.

APPLICATION FILED IIIAII. 9, I9I5.

1,158,176. PAIenIed oet. 26, 1915.

BINO 1B Witnesses M lnvenor COLUMBIA PLANoGu/WII cuwAsrIINaTuN.u1c.

A. 0. CHRISTENSEN. ELECTRIC COOKING STOVE.

APPLICATION FILED MAR. 9. 1915. 1,158,176. Patented 001.26, 1915.

2 SHEETS-SHEET 2.

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COLUMBIA PLANOUMPM co., WASHINGTDN, D. c.

Fron View Witness es NITEI) STATES PATENT ARTHUR O. CHRISTENSEN, OF FRANKLIN, NEW JERSEY.

ELECTRIC COOKING-STOVE.

Application filed March 9, 1915.

To all fao/wm t may concern.'

Be it known that I, ARTHUR O. CHnrs'rnN- snN, a citizen of the United States, and a resident ot Franklin, in the county of Sussex and State of New Jersey, have invented an Improved Electric Cooking-Stove, of which the following is a specification.

The invention includes certain novel features of construction, arrangement, andV combination of parts hereinafter described, whereby I produce a stove distinguished by heating apacity, efficiency, also by simplicity and durability of structure.

In the accompanying drawings Figure l is a perspective View of the stove. Fig. 2 is a vertical, longitudinal section of the stove, taken on a line adjacent to the front of same. Fig. 3 is a plan view of a radiating partition having diagonally arranged ribs, ridges and so-called separating ribs, with heating coils located between them. Fig. 3 is a cross section on line A A of Fig. 3. Fig. el is a plan view of a modified forni of partition, having no separating ribs or ridges. Fig. 4f is a front edge vieW of the partition shown in Fig. 4. Fig. 5 is a plan view of another term of radiating partition resembling the one shown in Fig. t. Fig. 5a is a front vieiv of the stove of which the partition shown in Fig. 5 forms a part. Fig. 6 is a plan of the lower partition to which the attachment pegs are connected. Fig. 6a is a vien7 showing attachment pegs and their nuts and Washers detached.

A in Figs. l, 2, 3, d and 5 indicates the heating coil consisting of round or vflat Wire, or ribbon of any suitable metal having suliicient electrical resistance for its purpose.

B in Figs. 2 and G indicates a secondary or resistance coil and is made of material similar to A. This coil is embedded in a non-electrical, but good heat conducting material, which in practice fills the space between the two horizontal partitions G and F.

C indicates the radiating partition which must be made of a refractory material that is non-conductive electrically, and will not materially degenerate by continual heating and cooling. there the secondary coil B is used, this partition C should be made of as good heat-conducting material as possible. During the operation of the stove this partition becomes heated. As it is backed below by non-conductive material its heat is radiated to the object placed on the stove to be Specification of Letters Patent.

Patented Oct. 26, 1915.

serial No. 13,127.

heated. Eventually this partition should give oil nearly as much heat as the heating element itself.

D, in Figs. l, 2, 3, e and 5 indicates the supporting ribs, or ridges which are made of the saine material as C, and in fact, formed integrally With it. Slots are made in these ribs, through which the heating Wire A is run. In the inished stove these slots may be sealed, and thus obscured. The ribs 'further serve to support any object placed on the stove to be heated.

E in Fig. 3 indicates supplemental ribs Which serve to prevent one portion of the heating coil from coming in contact With another, also to strengthen the diagonal ribs D and aid in supporting the object to be heated.

C, D and E are parts of a single or integral piece, which may be made of lire clay, magnesia, or any other snch heat-resisting material.

F, as shown in Figs. 2 and 6, is the lower partition arranged parallel to and spaced from partition C, and made of similar material. It serves to hold the attachment pegs L, L2, L3, securely in place, ee L2, L3- Figs. 2 and 6, and to separate the non-heat conductive material F from the good heat conducting material above it.

G is the bottom of the stove. ts shape and size correspond to the shape and size of partitions F, except that for inches, or so, along the center of each side of the bottoni the distance across the bottom corresponds tc the distance across al horizontal section of the stove. I'Ilhere the sides of the stove are 9,- thick this ear would project l for 2i, or so, along the middle of each side. This ear, interlocks in a space cut for it in the sides of the stove, as is shown in Figs. l and 2. rFhis interlocking of sides and bottom serves to hold the bottom lirinly in place and helps hold the sides together. Bottom G is preferably made of the same material as the sides H.

The stove is provided with legs which support the bottom G so that there is no danger of the stove overheating the table on which it stands.

The four sides of the stove are marked Il, the shape and size of which sides are shown in FiOs. l, 2 and 5. rEhe height and Width of the front and back sides correspond to the height and width of the sides of the stove. The other two sides correspond to the height ot the stove, but in width are only as much as the stoves inside dimensions. The sides are interlocked with the bottom, andV where the edges of the bottom come in contact with the sides this joint is cemented.

-In addition to this the partitions C and F are cemented to the sides, and, inally angle irons Q hold the sides securely together. These sides I-I should be made of a poor heat conducting material, strong enough to withstand wear, and able to endure heating and cooling without deteriorating. Pressed asbestos, baked-clay, magnesia, or other similar material may be used, but in the above description I have chosen asbestos because of its poor heat conductivity, its toughness and the ease with which it may be worked into desired shapes.

I represents corner blocks which serve to support partition F on bottom Gr.

J is a block of refractory material which holds the attachment pegs away from partition F, thus allowing them to pass through the front of the stove at a low point.

K indicates blocks separating partition C from partition F.

L', L2 and L3 are three attachment pegs which serve to conduct the electric current from the attachment plugs into the stove and to the heating element A and resistance coil B. These are preferably made of No. 5

German silver wire.

M is a nut, also of German silver, screwing on peg L and holding it rmly in partition F. It also forms a part of the contact between pegs and heating wires A and B.

N is a German silver washer, also serving to make the contact between the heating wires and pegs'.

O is a fg iron nut screwed firmly down so as to make a tight connection between heating wires and adjacent nut and washer as mentioned.

P is a poor heatconducting material capable of withstanding the high temperature. This fills the chamber between partitions F and G and serves to coniine the heat to the upper part of the stove. I prefer for this some form of asbestos, so placed as to offer as much air space as possible between the bers without allowing air circulation.

kQ in Figs. l and 2 indicates angle irons which serve to hold sides H firmly together and also hold partition C down. These anglev irons are secured to the sides II by bolts It, shown in Figs. 1, 2 and 5.

FiO. l shows a form of radiating partition whose corners serve as angle irons. Bolts B penetrate sides H and are tightened in threaded holes shown in front view of Fig. 4.

The angle irons used in the form of stove 'shown in Fig. 5, are evidently 135o instead oi' 90o. In this case these serve to support the radiating bottom.

While I have shown and described a preferred embodiment of my invention, with a few variations in form, it is to be understood that minor changes in details of construction, combination and arrangement oi parts may be made without departing from the spirit and scope of the invention claimed, or sacrificing any of the advantages thereof.

This stove is operated similarly to other electric stoves 4on the market, so but a brief description Vof its operation is required. Connection between the stove and the source of electrical energy is made through the customary house wiring and lamp socket to a cord on the end of which is attached a twohole plug for single or two-heat stoves such sistance is now offered to the flow of electricity and greater heat is generated.

In the case of a four-heat stove, such as represented in Fig. 5, there are three plugs connected to the end of the cable or cord, used for connecting the stove to the house wires. Each plug has a single hole to it over peg L. Two of these plugs are connected toV one electrical lead wire and the other is attached to the second wire. To distinguish between these plugs the former two are of one color, which we will call light,- and the latter of another color which we will call the dark. To heat only the inside coil as represented in Fig. 5, one plug is connected to L, while a plug of the other color is put on L3. To use only 'the outside coil one peg is connected to L and a peg of the other color to L2. To obtain minimum heat the two coils may be used in series by putting one plug on L2 and one of the other color on L3. To obtain maximum heat the heating coils are used in parallel by connecting the dark plug to L', and the two light ones to L2 and L3. By exposing the heating members to view the heat obtained by the various arrangements of plugs or pegs, is self-evident.

What is claimed is:

l. An electric stove comprising a body, having a bottom and a partition horizontal within said body, means for supporting said bottom and partition, heating wires supported by said partition and contact pegs secured tothe ends of said wires, the space between the above mentioned horizontal bottom and partition being filled with a poor heat-conducting material.

2. An electric stove designed for cooking, having a heating coil exposed on the upper side oi' the stove and a second coil embedded a little below this first named one in a refractory material, such second coil being designed for use only in series With the rst coil, thus serving as a resistance to the flow 10 of electricity in the iirst coil.

In testimony whereof I ahx my signature to this specification in presence of tWo Witnesses.

ARTHUR O. CHRISTENSEN. Witnesses:

SYDNEY HALL, HENRY L. CORNELISVEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

